import { constantRoutes } from '@/router'
// 导入获取菜单数据的方法
import {getMenuList} from '@/api/user'
// 导入layout组件
import layout from '@/layout'

/**
 * Use meta.role to determine if the current user has permission
 * @param roles
 * @param route
 */
function hasPermission(roles, route) {
  if (route.meta && route.meta.roles) {
    return roles.some(role => route.meta.roles.includes(role))
  } else {
    return true
  }
}

/**
 * Filter asynchronous routing tables by recursion
 * @param routes asyncRoutes
 * @param roles
 */
export function filterAsyncRoutes(routes, roles) {
  const res = []
  routes.forEach(route => {
    const tmp = { ...route }
    // 判断是否相应的权限
    if (hasPermission(roles, tmp)) {
        // 获取组件
        let component = tmp.component;
        // 判断是否有相应的组件
        if (route.component){
          // 判断是否是跟组件
          if (component === 'Layout'){
            tmp.component = layout;
          }else {
            // 获取对应的具体的组件信息
            tmp.component = (resolve) => require([`@/views${component}.vue`],resolve)
          }
        }
        // 判断是否有子菜单
        if (tmp.children) {
          tmp.children = filterAsyncRoutes(tmp.children, roles)
        }
      res.push(tmp)
    }
  })

  return res
}

const state = {
  routes: [],
  addRoutes: []
}

const mutations = {
  SET_ROUTES: (state, routes) => {
    state.addRoutes = routes
    state.routes = constantRoutes.concat(routes)
  }
}

const actions = {
  /**
   *生成动态路由
   * @param commit
   * @param roles
   * @returns {Promise<unknown>}
   */
  generateRoutes({ commit }, roles) {
    return new Promise((resolve,reject) => {
      // 发送查询菜单数据的请求
      getMenuList().then(res =>{
        console.log(res);
        // 存放对应权限的路由信息
        let accessedRoutes;
        // 如果状态码为200 则表示成功
        if (res.code === 200){
          accessedRoutes = filterAsyncRoutes(res.data, roles)
        }
        // 将路由信息保存到store中
        commit('SET_ROUTES', accessedRoutes)
        resolve(accessedRoutes)
      }).catch(error =>{
        reject(error);
      });
    })
  }
}

export default {
  namespaced: true,
  state,
  mutations,
  actions
}
